v4.19.13 snapshot.
diff --git a/drivers/media/usb/pwc/pwc-uncompress.c b/drivers/media/usb/pwc/pwc-uncompress.c
new file mode 100644
index 0000000..98c46f9
--- /dev/null
+++ b/drivers/media/usb/pwc/pwc-uncompress.c
@@ -0,0 +1,107 @@
+/* Linux driver for Philips webcam
+ Decompression frontend.
+ (C) 1999-2003 Nemosoft Unv.
+ (C) 2004-2006 Luc Saillard (luc@saillard.org)
+
+ NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
+ driver and thus may have bugs that are not present in the original version.
+ Please send bug reports and support requests to <luc@saillard.org>.
+ The decompression routines have been implemented by reverse-engineering the
+ Nemosoft binary pwcx module. Caveat emptor.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ vim: set ts=8:
+*/
+
+#include <asm/current.h>
+#include <asm/types.h>
+
+#include "pwc.h"
+#include "pwc-dec1.h"
+#include "pwc-dec23.h"
+
+int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf)
+{
+ int n, line, col;
+ void *yuv, *image;
+ u16 *src;
+ u16 *dsty, *dstu, *dstv;
+
+ image = vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0);
+
+ yuv = fbuf->data + pdev->frame_header_size; /* Skip header */
+
+ /* Raw format; that's easy... */
+ if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
+ {
+ struct pwc_raw_frame *raw_frame = image;
+ raw_frame->type = cpu_to_le16(pdev->type);
+ raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength);
+ /* cmd_buf is always 4 bytes, but sometimes, only the
+ * first 3 bytes is filled (Nala case). We can
+ * determine this using the type of the webcam */
+ memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
+ memcpy(raw_frame+1, yuv, pdev->frame_size);
+ vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
+ pdev->frame_size + sizeof(struct pwc_raw_frame));
+ return 0;
+ }
+
+ vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
+ pdev->width * pdev->height * 3 / 2);
+
+ if (pdev->vbandlength == 0) {
+ /* Uncompressed mode.
+ *
+ * We do some byte shuffling here to go from the
+ * native format to YUV420P.
+ */
+ src = (u16 *)yuv;
+ n = pdev->width * pdev->height;
+ dsty = (u16 *)(image);
+ dstu = (u16 *)(image + n);
+ dstv = (u16 *)(image + n + n / 4);
+
+ for (line = 0; line < pdev->height; line++) {
+ for (col = 0; col < pdev->width; col += 4) {
+ *dsty++ = *src++;
+ *dsty++ = *src++;
+ if (line & 1)
+ *dstv++ = *src++;
+ else
+ *dstu++ = *src++;
+ }
+ }
+
+ return 0;
+ }
+
+ /*
+ * Compressed;
+ * the decompressor routines will write the data in planar format
+ * immediately.
+ */
+ if (DEVICE_USE_CODEC1(pdev->type)) {
+
+ /* TODO & FIXME */
+ PWC_ERROR("This chipset is not supported for now\n");
+ return -ENXIO; /* No such device or address: missing decompressor */
+
+ } else {
+ pwc_dec23_decompress(pdev, yuv, image);
+ }
+ return 0;
+}